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Drainage / Building & Plumbing
Floor Drains
Cast iron and stainless floor drains for commercial kitchens, industrial spaces, restrooms, and mechanical rooms — finish-floor, area, integral-trap, and specialty models. Free shipping.
A floor drain channels unwanted water and liquid waste from interior surfaces safely into the sanitary or stormwater system, preventing pooling, structural damage, and slip hazards. Our floor drains span finish-floor, area, integral-trap, flushing-rim, and specialty models with cast iron or stainless bodies, serviceable strainers, and outlet configurations to match the load class, finish, and code requirements of the space.
Zurn Floor Drains
Watts Floor Drains
How Floor Drains Work
A floor drain collects water and liquid waste at the floor surface and directs it into the sanitary or stormwater piping, keeping interiors safe, hygienic, and dry. From showers and restrooms to kitchens, warehouses, concourses, and parking decks, the right floor drain improves safety, hygiene, and building durability.
A modern floor drain combines a rugged drain body, a serviceable strainer or head, and an outlet connection to the piping system. Options include integral traps for odor control, trap primer ports to keep seals charged, debris buckets for solids, and waterproofing clamps or deck plates for membrane tie-in.
Common Types & Where They're Used
Floor drains come in several forms, each tailored for specific load demands, aesthetics, and installation constraints:
Finish-Floor Drains
Low-profile, adjustable tops for showers, locker rooms, and restrooms — set flush with tile or terrazzo.
Area Drains
Medium to extra heavy-duty drains for kitchens, warehouses, and production areas with higher flows and traffic.
Integral-Trap Drains
A built-in water seal reduces odors — ideal for retrofits or tight spaces where a separate trap won't fit.
Flushing-Rim Drains
A water-fed rim rinses the bowl for animal care, food prep, and breweries where sanitation matters.
Trench Drains
Linear capture along thresholds, plazas, and loading zones wherever sheet flow occurs across a surface.
Specialty Drains
Kettle, planter, isolation-deck, ligature-resistant, and stainless models for cleanrooms and food zones.
How to Choose: A Quick Spec Checklist
Match the drain to the space by working through these six factors:
- Floor finish — tile, terrazzo, resinous, or concrete determines the head style and clamp.
- Load class — pedestrian, light vehicular, or heavy traffic sets the body and grate rating.
- Hydraulics — required flow rate and the debris size/profile you need to pass.
- Sanitation — whether the space needs an integral trap or a flushing rim.
- Waterproofing — clamp ring, weep paths, and deck plate for membrane tie-in.
- Security — hinged or secured tops and vandal-resistant screws where required.
For amenity spaces, choose finish-floor heads (round or square) that sit flush with the tile. For wet-process zones, specify area drains with debris buckets or trench drains to manage higher flows and solids.
Specifications at a Glance
| Bodies | Cast iron for durability; stainless steel for hygiene and corrosion resistance |
| Tops | Perforated, slotted, tractor, or heel-proof; round or square |
| Adjustability | Elevation and rotation to set the strainer perfectly flush |
| Options | Trap primer ports, debris buckets, anchor lugs |
| Accessories | Clamp rings, weep systems, deck plates, sediment baskets |
| Compliance | ADA / heel-proof patterns where required |
Always confirm outlet size and type, load class, top style, finish, and accessories on the project submittal and plumbing schedule.
Floor Drain Installation Best Practices
01Rough-In & Elevation
Tie bodies to reinforcement, align the outlet to the branch piping, and set top elevation to the finish thickness so the strainer sits flush.
02Waterproofing Interface
Use clamp rings and weep paths with tile, or deck plates on membranes. Protect grate ledges during pours to avoid concrete fouling.
03Commissioning & O&M
Water-test, verify weep function, secure tops with the specified hardware, and document the model and options for maintenance.
Case Study: Distribution Center Retrofit
A 500,000-sq-ft distribution center replaced undersized spot drains with a mix of extra heavy-duty area drains in the aisles and trench drains at the dock doors. The upgrade cut ponding calls by roughly 45% in the first rainy season and reduced cleanup time after pallet-wash cycles, thanks to larger open-area grates and debris buckets.
Floor Drain FAQ
How do I pick round vs. square tops?
It's mostly about the finished floor. Round strainers suit poured finishes and tight retrofits and are the traditional look, while square tops align cleanly with tile and terrazzo grid lines for amenity spaces. Both are available heel-proof; choose the pattern and open area that meet your flow and code needs.
When should I use a trap primer?
Use a trap primer whenever a floor drain's trap could dry out from infrequent use — common in mechanical rooms, back-of-house areas, and seasonal spaces. The primer periodically adds water to keep the trap seal charged, which stops sewer gas from entering through an evaporated trap. Specify a trap primer port on the drain body.
Area drain or trench drain?
Choose an area drain for a point low spot that collects water from the surrounding slope — kitchens, production areas, and washdown zones. Choose a trench drain when water runs as sheet flow across a surface and you need linear capture — thresholds, plazas, and dock doors. Many large facilities use both.
Do floor drains have a trap?
They need one. A trap holds a water seal that blocks sewer gas from rising through the drain. Some floor drains have an integral (built-in) trap, while others connect to a separate P-trap in the piping below. In low-use locations, pair the trap with a trap primer so the seal doesn't evaporate.
What's the difference between cast iron and stainless floor drains?
Cast iron bodies are the workhorse choice — durable and cost-effective for general commercial and industrial use. Stainless steel is specified where hygiene and corrosion resistance matter most, such as food processing, breweries, cleanrooms, and washdown environments.
What load class do I need?
Match the grate and body rating to the traffic: pedestrian-duty for restrooms and locker rooms, light-vehicular for light commercial, and heavy or extra heavy-duty for warehouses, production floors, and areas that see forklifts or trucks. When in doubt, size up — an under-rated grate can deform under load.